Well, I'll be honest, I didn't see it coming....LOL.
Actually I have (had) 2 Liberties. They're actually fairly rugged little "trucks". Basically what you'd get if you took a 1/2 ton Dodge truck and put it in a compactor and squished it a little.
I've towed some fairly heavy things over the years. 9' transport farm disc, machinery, etc. I've even towed our other Liberty with my Liberty cross country. If you have trailer brakes you can tow fairly heavy things. I'd be careful otherwise. I run 10 ply tires on one and on the other I used regular M/S tires when we drove it. 10 ply tires stiffen it up a good bit for towing.
You need a mechanical fan if you plan to tow anything much. That electric fan nonsense is a weak link for sure.
They're not a heavy 3/4 ton truck by any means, but are pretty substantial, especially when you compare them to something like a late model Cherokee (I also have one).